The MCI_DGV_WINDOW_PARMS structure contains parameters for MCI_WINDOW command for digital-video devices.
typedef struct {
    DWORD dwCallback; 
    WORD  hWnd; 
    WORD  nCmdShow; 
    LPSTR lpstrText; 
} MCI_DGV_WINDOW_PARMS; 
 When assigning data to the members of this structure, set the corresponding flags in the fdwCommand parameter of the mciSendCommand function to validate the members
  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in digitalv.h.
  Unicode: Defined as Unicode and ANSI structures.
MCI Overview, MCI Structures, MCI_WINDOW, mciSendCommand